In the USA,the dog food is even more expensive than food eaten by people,is that right? Actually,I am kind of not believing it,because I think if dog food is more expensive than food eaten by people,there is not neccesarily that dog food should exist,because dogs can also eat some food that can eaten by human,for example,ham sausage,or something that not expensive?I prefer the answers from American native.Actually,this question derives from some sentences in my textbooks.I don't know what is the really the case,so I turn to you for help.From the textbook,saying"The Washington Post newspaper has estimated that the elderly poor consume more dog food than is eaten by dogs."And our teacher who come from America became angry and said it's not true because dog food is much more expensive than food eaten by people,how do you see it?